/**
  * Translate the transfer type from this element.
  *
  * @param name The attribute name.
  * @return The transfer instance.
  */
 private Transfer parseTransferType(String name) {
   if ("TextTransfer".equals(name)) { // $NON-NLS-1$
     return TextTransfer.getInstance();
   }
   if ("ImageTransfer".equals(name)) { // $NON-NLS-1$
     return ImageTransfer.getInstance();
   }
   if ("FileTransfer".equals(name)) { // $NON-NLS-1$
     return FileTransfer.getInstance();
   }
   if ("LocalSelectionTransfer".equals(name)) { // $NON-NLS-1$
     return LocalSelectionTransfer.getTransfer();
   }
   return null;
 }
Esempio n. 2
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  public ImageViewer(Composite parent, int style) {
    super(parent, style);

    GridLayout gl = new GridLayout(1, false);
    gl.horizontalSpacing = 0;
    gl.verticalSpacing = 0;
    gl.marginHeight = 0;
    gl.marginWidth = 0;
    setLayout(gl);

    canvas = new ImageViewCanvas(this, SWT.NONE);
    canvas.setLayoutData(new GridData(GridData.FILL_BOTH));

    // Add DND support
    Transfer[] types = new Transfer[] {ImageTransfer.getInstance()};
    int operations = DND.DROP_COPY;

    final DragSource source = new DragSource(canvas, operations);
    source.setTransfer(types);
    source.addDragListener(
        new DragSourceListener() {
          @Override
          public void dragStart(DragSourceEvent event) {}

          @Override
          public void dragSetData(DragSourceEvent event) {
            if (canvas.getImageData() != null) {
              event.data = canvas.getImageData();
            } else {
              event.data = null;
            }
          }

          @Override
          public void dragFinished(DragSourceEvent event) {}
        });
  }
  public static void main(String[] args) {
    final Display display = new Display();
    final Clipboard clipboard = new Clipboard(display);
    final Shell shell = new Shell(display, SWT.SHELL_TRIM);
    shell.setLayout(new GridLayout());
    shell.setText("Clipboard ImageTransfer");

    final Button imageButton = new Button(shell, SWT.NONE);
    GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
    gd.minimumHeight = 400;
    gd.minimumWidth = 600;
    imageButton.setLayoutData(gd);

    final Text imageText = new Text(shell, SWT.BORDER);
    imageText.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));

    Composite buttons = new Composite(shell, SWT.NONE);
    buttons.setLayout(new GridLayout(4, true));
    Button button = new Button(buttons, SWT.PUSH);
    button.setText("Open");
    button.addListener(
        SWT.Selection,
        event -> {
          FileDialog dialog = new FileDialog(shell, SWT.OPEN);
          dialog.setText("Open an image file or cancel");
          String string = dialog.open();
          if (string != null) {
            imageButton.setText("");
            Image image = imageButton.getImage();
            if (image != null) image.dispose();
            image = new Image(display, string);
            imageButton.setImage(image);
            imageText.setText(string);
          }
        });

    button = new Button(buttons, SWT.PUSH);
    button.setText("Copy");
    button.addListener(
        SWT.Selection,
        event -> {
          Image image = imageButton.getImage();
          if (image != null) {
            ImageTransfer imageTransfer = ImageTransfer.getInstance();
            TextTransfer textTransfer = TextTransfer.getInstance();
            clipboard.setContents(
                new Object[] {image.getImageData(), imageText.getText()},
                new Transfer[] {imageTransfer, textTransfer});
          }
        });

    button = new Button(buttons, SWT.PUSH);
    button.setText("Paste");
    button.addListener(
        SWT.Selection,
        event -> {
          ImageData imageData = (ImageData) clipboard.getContents(ImageTransfer.getInstance());
          if (imageData != null) {
            imageButton.setText("");
            Image image = imageButton.getImage();
            if (image != null) image.dispose();
            image = new Image(display, imageData);
            imageButton.setImage(image);
          } else {
            imageButton.setText("No image");
            imageButton.setImage(null);
          }
          String text = (String) clipboard.getContents(TextTransfer.getInstance());
          if (text != null) {
            imageText.setText(text);
          } else {
            imageText.setText("");
          }
        });

    button = new Button(buttons, SWT.PUSH);
    button.setText("Clear");
    button.addListener(
        SWT.Selection,
        event -> {
          imageButton.setText("");
          Image image = imageButton.getImage();
          if (image != null) image.dispose();
          imageButton.setImage(null);
          imageText.setText("");
        });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) display.sleep();
    }
    display.dispose();
  }